Skip to Content


Medically reviewed on June 27, 2017.

Dosage form: syrup
Ingredients: Diphenhydramine hydrochloride 12.5mg in 5mL
Labeler: Silarx Pharmaceutical, Inc
NDC Code: 54838-154

Disclaimer: Most OTC drugs are not reviewed and approved by FDA, however they may be marketed if they comply with applicable regulations and policies. FDA has not evaluated whether this product complies.

Silphen Cough Syrup

Active Ingredient: Diphenhydramine hydrochloride 12.5 mg (in each 5 mL(teaspoonful)(TSP))

Purpose: Antitussive


temporarily relieves coughs due to cold or bronchial irritation


Do not use with any other product containing diphenhydramine, even one used on skin

Ask a doctor before use if you have

  • persistent or chronic cough such as occurs with smoking, asthma, or emphysema
  •  cough is accompanied by excessive phlegm (mucus)
  • breathing problem such as emphysema or chronic bronchitis
  • glaucoma
  • trouble urinating due to an enlarged prostate gland

Stop use and ask a doctor

if symptoms last for more than 1 week or recurred or accompanied by fever, rash, headache

Ask a doctor or pharmacist before use

if you are  taking tranquilizers or sedatives

When using this product
  • you may get drowsy
  • avoid alcoholic drinks
  • be careful when driving a motor vehicle or operating machinery
  • excitability may occur, especially in children

If pregnant or breast-feeding

  •  ask a health professional before use.

Keep out of reach of children.

  • In case of accidental overdose, get medical help or contact a Poison Control Center right away.

Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away.


Do not take more than six doses

Adults and children over 12 years
2 teaspoonfuls (TSP) every 4 hours
children under 12 years

Other information
  • Store below 20°-25°C (68°-77°F)
  •  Protect from freezing.

Inactive ingredients:

Alcohol 5%, ammonium chloride, citric acid, D&C red no. 33, FD&C red no. 40, menthol, methylparaben, propylene glycol, propylparaben, sodium citrate, strawberry flavor, sucrose, water

Questions: 888-974-5279

Manufactured by:

Sliarx Pharmaceutical, Inc
1033 Stoneleigh Ave.
Carmel, NY 10512 USA.

diphenhydramine hydrochloride syrup
Product Information
Product TypeHUMAN OTC DRUGItem Code (Source)NDC:54838-154
Route of AdministrationORALDEA Schedule    
Active Ingredient/Active Moiety
Ingredient NameBasis of StrengthStrength
Diphenhydramine hydrochloride (Diphenhydramine) Diphenhydramine hydrochloride12.5 mg  in 5 mL
Inactive Ingredients
Ingredient NameStrength
ammonium chloride 
anhydrous citric acid 
D&C red no. 33 
FD&C red no. 40 
propylene glycol 
sodium citrate 
Product Characteristics
Color    Score    
FlavorSTRAWBERRY (Strawberry Flavor) Imprint Code
#Item CodePackage Description
1NDC:54838-154-40118 mL in 1 BOTTLE, PLASTIC
2NDC:54838-154-70237 mL in 1 BOTTLE, PLASTIC
3NDC:54838-154-80473 mL in 1 BOTTLE, PLASTIC
Marketing Information
Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
OTC monograph finalpart34112/03/1993
Labeler - Silarx Pharmaceutical, Inc (161630033)

Silarx Pharmaceutical, Inc

Disclaimer: Every effort has been made to ensure that the information provided here is accurate, up-to-date and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. This information has been compiled for use by healthcare practitioners and consumers in the United States. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate that the drug or combination is safe, effective or appropriate for any given patient. If you have questions about the substances you are taking, check with your doctor, nurse or pharmacist.